Table 2.

Degree of dependency (Barthel index) in affected and unaffected residents, attack rates and rate ratio (RR) in residents with total or severe dependence versus residents with moderate, low or no-dependence.

Degree of dependency	Affected residents	Unaffected residents	Attack rate (%)	RR (95% CI)
Total dependency (0–20)	45	13	77.59
Severe dependency (21–60)	87	10	89.69
Moderate dependency (61–90)	48	22	68.57
Low dependency (91–99)	5	2	71.43
Independent (100)	3	1	75
Total + severe	132	23	85.16	1.23 (1.05–1.45)
Moderate + low + No dependence	56	25	69.13	1